File:Boston Public Library main stairs McKim 07092014.jpg|thumb|Looking down at the entrance stairway to the McKim Building (2014)
The '''Boston Public Library''' is a municipal public library system
, United States
, founded in 1848.
The Boston Public Library is also the Library for the Commonwealth
(formerly ''library of last recourse'')
[Declared in 1970 by law. Massachusetts General Laws, Chapter 78, Section 19C, paragraph 4]
of the Commonwealth of Massachusetts
; all adult residents of the commonwealth are entitled to borrowing and research privileges, and the library receives state funding. The Boston Public Library contains approximately 23 million items encompassing all formats including books, DVDs, CDs, maps, music scores, microfilm, manuscripts, prints and other visual materials,
and electronic resources, making it the third-largest public...